Tunisian security forces have arrested the nephew of Berlin market attacker, Anis Amri, and two other suspects, officials say.
The Tunisian Interior Ministry, said the three, aged between 18 and 27, were members of a “terrorist cell”, and that they were detained on Friday.
This followed a lorry attack on Monday, on a Christmas market, which left 12 people dead and 49 injured.
Tunisian-born Amri, 24, was shot dead by police in the Italian city of Milan in the early hours of Friday.
German authorities said fingerprints they provided, confirmed the dead man was Amri.
In its bid to deter terror attacks, Tunisia has taken its war beyond weapons and intelligence, with the completion of the first part of a 200km barrier made of sand banks and water trenches along its border with Libya.
Tunisia’s Defence Minister, Farhat Horchani, announced on Saturday that the second phase of the project would involve installing electronic equipment with the help of Germany and the US.
According to Tunisian Security Forces, the defences designed to make the border impassable by vehicles, had already helped to reduce smuggling.
The construction of the barrier was announced last summer after 38 people were killed on a beach by a gunman said to have trained in Libya.
More than 3,000 Tunisians had left to fight with the Islamic State (ISIS) group and other Islamist militants in Syria and Iraq, but Mr Horchani said that many had since returned to join the group in Libya.
Tunisia has lifted a State of Emergency three years after it was imposed, in a largely symbolic move to show security is improving in the North African state.
Since the 2011 uprising that ousted autocrat, Zine El-Abidine Ben Ali, Tunisian security forces have been battling militants from the hard-line Islamist movement Ansar al-Sharia, one of the radical groups to emerge after Ben Ali’s fall.
“The President of the Republic issued a decree to lift the State of Emergency beginning on March 5, 2014,” a statement from the Presidency said on Thursday.
The State of Emergency had kept security forces on alert across the country and given troops and Police authority to intervene in protests. Troops have arrested dozens of militants and killed others during raids over the past few months.
It has also affected tourism, which is a major part of Tunisia’s economy. Almost 7 million tourists came to the country in 2010, a few months before the uprising. Last year, that was down to about 6 million in 2012.
Attracting more tourists will help Tunisia to stabilize its economy. Then it can carry out reforms demanded by international lenders, who want to see the state reduce its budget deficit and trim public spending.
Prime Minister, Mehdi Jomaa said on Monday that “terrorism” had left, without giving details. Ansar al Sharia has been blamed for clashes with security forces and for a suicide bombing at a beach resort at the end of last year – the first such attack in Tunisia in more than a decade.